Septic tanks, sealed cesspools and package treatment plants work in different ways. The guides in this library cover the main system types and components, routine maintenance and faults that may need separate investigation.
System identification: manufacturer, model and system type.
Use and maintenance: properties served, occupancy and last emptying or service date.
Observed problem: slow drainage, alarm, odour, backing-up or wet ground.
Discharge arrangement: where effluent goes and which UK nation the property is in.
Reference sources for this library
These sources support the technical descriptions in the library. Manufacturer information applies to the named product or model and must not be treated as a specification for a different installation. Regulatory sources apply only within their stated jurisdiction.
A compact biofilter provides an additional biological treatment stage and is distinct from a septic tank operating on its own. Maintenance depends on the installed product and its treatment arrangement.
Reference checklist and technical facts
Biofilter manufacturer and model.
Service history and the upstream tank arrangement.
A package sewage treatment plant uses a defined treatment process and may include mechanical or electrical equipment. Operation, desludging and servicing requirements depend on the installed make and model.
Reference checklist and technical facts
Plant manufacturer and model.
Recent service history, alarms or changes in performance.
Some off-mains systems use a septic tank followed by a separate secondary treatment stage. The downstream equipment and final discharge arrangement determine how the complete system should be maintained.
Reference checklist and technical facts
Downstream treatment stage: type, manufacturer or model, and who services it.
Overall system identification: manufacturer, model and whether the primary unit is a septic tank, sealed cesspool or treatment plant.
Final discharge: where the effluent goes and which UK nation the property is in.
A shared private sewage system serves more than one property. Loading, maintenance responsibility and the effect of a fault can therefore extend beyond a single household.
Reference checklist and technical facts
Properties connected to the shared system.
Known operator or maintenance responsibility and recent service history.
